Centrifugal pump.



W. SGHBUEMANN. GENTRIFUGAL PUMP. APPLICATION FILED DEC. 29, 1910.

Patented Jan. 7, 1913.

UNITED STATES PATENT onnioa.

WALTER SCHEURlVIANN, F NEWARK-UPON-TRENT, ENGLAND, ASSIGNOR TO HENRY R. WORTHIN GTON, A CORPORATION OF NEW JERSEY.

CENTRIFUGAL PUMP.

Specification of Letters Patent.

Patented Jan. 7,1913.

Application filed December 29, 1910. Serial No. 599,803.

. To all whom it may concern:

Be it known that I,WALTER SGHEURMANN,

l a citizen of the Republic of Switzerland, re-

siding at Newark-upon-Trent, England, have invented certain new and useful Improvements in Centrifugal Pumps, fully described and represented in the following specification and the accompanying drawings, forming a partof the same.

This invention relates to certain improvements in centrifugal pumps, and is intended especially sto secure greater efficiency when such pumps are used for fire or similar service, in which a stream is to be thrown.

It is well known that centrifugal pumps, although otherwise better adapted for fire service than reciprocating pumps, do not throw as good astream as the latter, but the jet soon breaks and is shorter and less effective. This, probably, is explained by the rotary movement of the water in discharge,

which tends to make the jet from the fire nozzle spread out, so as to be subjected to a larger air resistance, and break. I avoid this difiiculty by arranging on the discharge side of the pump a diaphragm with small openings through which the water is forced," so that the water passes through a large number of small passages at comparatively low velocity, and the tendency to spreading is taken out or reduced. The water leaving these passages preferably enters a comparatively large chamber and for the purpose of still further steadying the flow, an air chamber or cushion is preferably added. The invention includes, however, the use of a diaphragm, with or without the enlarged chamber or air cushion. The diaphragm preferably is conical in form, with passages substantially parallel to the discharge flow, but the invention includes diaphragms of other suitable forms.

In the accompanying drawings forming a part of this specification, preferred forms of constructions embodying the invention are shown for the purpose of illustration, and these constructions will now be described in detail and the features forming the invention specifically pointed out in the claims. v

In the drawings :-Figure 1 is a sectional elevation of a centrifugal pump embodying the invention; Fig. 2 is a detail view on an enlarged scale of the diaphragm of Fig. 1;

Fig. 3 is a horizontal section on the line 3 of Fig.2. Fig. 4 is a view similar to Fig. 2 showing another form of diaphragm.

Referring to said drawings, A is a centrifugal pump having the discharge B, on which is an enlarged, chamber C with air chamber D thereon, from which enlarged chamber C the liquid passes, through outlet E to the fire nozzle or other jet device. Between the discharge B. and enlarged chamber C is placed a diaphragm F, shown as a hollow cone, with its base toward the discharge B, so as to secure the total area of discharge openings desired, and this, in the construction shown in Figs. 1 to 3, is formed of a series of rings 1 having slots between them forming small passages through which the liquid passes from the discharge B to chamber C. These rings are preferably set edgewise vertically, so as to form passages substantially parallel with the discharge flow, and taper downward to an edge, this form interfering less with the flow of liquid, while securing the desired result. Other forms of diaphragms and passages may be used, however, as for instance, the perforated diaphragm G shown in Fig. 4, with openings 3 through the diaphragm, preferably formed parallel with the discharge flow, as shown.

It is to be understood that the invention is not limited to the exact form or arrange- .ment of parts shown, but that these may be modified within the invention defined by the claims.

What is claimed is 1. The combination with a centrifugal pump, of a diaphragm on the discharge side of the pump provided with small openings through which the liquid passes, and a discharge passage beyond said openings, substantially as and for the purpose described.

2. The combination with a centrifugal pump, of a conical diaphragm on the discharge side of the pump provided with small openings through which the liquid passes, and a discharge passage beyond said openings, substantially as and for the pur-' pose described.

3. The combination with a centrifugal pump, of a conical diaphragm on the discharge side of the pump formed of a series of rings-set edgewisc to the discharge How to form a series of narrow slot-s through which the liquid passes, and a discharge passage beyond said slots, substantially as and for the purpose described.

4:. The combination with a centrifugal pump, of a diaphragm on the discharge side of the pump provided with small openpump, of a diaphragm on the discharge side of the pump provided with small openings through which the liquid passes, an enlarged chamber outside the diaphragm, a discharge passage beyondsaid openings, and an air chamber on the discharge outside the diaphragm, substantially as and for the purpose described.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

WALTER SOHEURMANN.

Witnesses: 1

E. P. SIMPSON, G. F. SANDIFORD.

Gopies :,of this patent may be obtained for five cents each, by addressing the Washington, D. C.

f Commissioner of Patents. 

